New mechanism for mappings between old and produced declarations

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.backend.wasm
 
-import org.jetbrains.kotlin.backend.common.CommonBackendContext
 import org.jetbrains.kotlin.backend.common.ir.Ir
 import org.jetbrains.kotlin.backend.common.ir.Symbols
 import org.jetbrains.kotlin.backend.js.JsDeclarationFactory
@@ -14,6 +13,8 @@ import org.jetbrains.kotlin.descriptors.ModuleDescriptor
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.descriptors.impl.EmptyPackageFragmentDescriptor
 import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.backend.js.JsCommonBackendContext
+import org.jetbrains.kotlin.ir.backend.js.JsMapping
 import org.jetbrains.kotlin.ir.backend.js.JsSharedVariablesManager
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
@@ -34,7 +35,7 @@ class WasmBackendContext(
     irModuleFragment: IrModuleFragment,
     val additionalExportedDeclarations: Set<FqName>,
     override val configuration: CompilerConfiguration
-) : CommonBackendContext {
+) : JsCommonBackendContext {
     override val builtIns = module.builtIns
     override var inVerbosePhase: Boolean = false
     override val scriptMode = false
@@ -49,7 +50,9 @@ class WasmBackendContext(
         )
     }
 
-    override val declarationFactory = JsDeclarationFactory()
+    override val mapping = JsMapping()
+
+    override val declarationFactory = JsDeclarationFactory(mapping)
 
     val objectToGetInstanceFunction = mutableMapOf<IrClassSymbol, IrSimpleFunction>()
     override val internalPackageFqn = FqName("kotlin.wasm")